[PATCH 5/6] hw/nvram/eeprom_at24c: Add I2C write helper

[Peter Delevoryas <peter@pjd.dev>]

Signed-off-by: Peter Delevoryas <peter@pjd.dev>
---
 hw/nvram/eeprom_at24c.c         | 15 +++++++++++++++
 include/hw/nvram/eeprom_at24c.h |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/hw/nvram/eeprom_at24c.c b/hw/nvram/eeprom_at24c.c
index 0c27eae2b354..69565a420c28 100644
--- a/hw/nvram/eeprom_at24c.c
+++ b/hw/nvram/eeprom_at24c.c
@@ -10,6 +10,7 @@
 #include "qemu/osdep.h"
 
 #include "qapi/error.h"
+#include "qemu/bitops.h"
 #include "qemu/module.h"
 #include "hw/i2c/i2c.h"
 #include "hw/nvram/eeprom_at24c.h"
@@ -138,6 +139,20 @@ void at24c_eeprom_init(I2CBus *bus, uint8_t address, uint32_t rom_size)
     i2c_slave_realize_and_unref(i2c_dev, bus, &error_abort);
 }
 
+void at24c_eeprom_write(I2CBus *bus, uint8_t address, uint16_t offset,
+                        const uint8_t *buf, uint32_t len)
+{
+    int i;
+
+    i2c_start_send(bus, address);
+    i2c_send(bus, extract16(offset, 8, 8));
+    i2c_send(bus, extract16(offset, 0, 8));
+    for (i = 0; i < len; i++) {
+        i2c_send(bus, buf[i]);
+    }
+    i2c_end_transfer(bus);
+}
+
 static void at24c_eeprom_realize(DeviceState *dev, Error **errp)
 {
     EEPROMState *ee = AT24C_EE(dev);
diff --git a/include/hw/nvram/eeprom_at24c.h b/include/hw/nvram/eeprom_at24c.h
index 9d9cf212757c..bbca73a07ad1 100644
--- a/include/hw/nvram/eeprom_at24c.h
+++ b/include/hw/nvram/eeprom_at24c.h
@@ -6,5 +6,7 @@
 #include "hw/i2c/i2c.h"
 
 void at24c_eeprom_init(I2CBus *bus, uint8_t address, uint32_t rom_size);
+void at24c_eeprom_write(I2CBus *bus, uint8_t address, uint16_t offset,
+                        const uint8_t *buf, uint32_t len);
 
 #endif
-- 
2.39.0